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2 1 Balaton Limnological Research Institute ofthe Hungárián Academy of Sciences, H-8237 Tihany, Hungary 2 Department ofZoology, University of Leicester, University Road, Leicester LEI 7RH, U.K. Abstract. Oxygen consumption of Corophium curvispinum, the dominant amphipod species in Laké Balaton was studied with the Winkler method at various temperatures. Specific oxygen consumption (= metabolic rate MR) increased exponentially with the temperature: MR = exp(0 069T- 1.528), r = 0 827, where MR = metabolic rate or specific oxygen consumption (jig 0

2 mg ' wet weight h'), T= temperature in °C. The oxygen consumption of C. curvispinum was studied with an open flow respirometer in different oxygen concentrations produced using a gas mixing column through which O2 and N2 gas was bubbled at controlled rates. Free moving amphipod oxygen consumption was measured alsó ater they had been allowed to settle within small polythene tubes. Animals settling in tubes consume significantly (p < 0.001, ANOVA) more oxygen than those moving free in the respiration chamber The oxygen consumption of the animals can be deseribed with the following equation: y' — 242 86 ln(x) - 77 23, r

2 = 0 68 where y

1 = oxygen consumption (|J O2 g'

1 h'

1) of animals moving freely in the respiration chamber, x = oxygen concentration (mgT

1); y

2= 309 ln(x) + 181.51, r

2 = 0.82, where y

2= oxygen consumption of the animals settling in tűbe in the respiration chamber, x = oxygen concentration (mgl"'). The number of animals leaving their tubes was recorded. Approximately 20 % of the amphipods leaved the tubes when oxygen concentrations were below 3 mgl'

1. Key words: respiration, Corophium curvispinum, temperature, hypoxia, tube-dwelling.